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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6489169fb76c24f19770ac5ad4c9ead15bc59b6028beda055c107644dd49afd' 
  AND token = 'fq387bRBNac3bh4jk80EN05oqEZHZKwcku8MHNkTqVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}